Tunnel advanced drilling geological refined forecasting method and application

Abstract

The invention relates to a tunnel advanced drilling geological refined forecasting method and application. Geological forecasting is carried out on an unknown stratum of a tunnel by utilizing an energy theory, and the method comprises the following steps: firstly, collecting original drilling data of a multifunctional drilling machine, including drilling parameters of the multifunctional drilling machine, on-site liquid return and deslagging, tunnel face surrounding rock condition records and the like; then processing original drilling data of the multifunctional drilling machine, including removal and interpolation of abnormal drilling parameters at the position of a connecting rod, roughly partitioning a rock stratum according to liquid returning and deslagging records, and further calculating an RTPR value based on an energy theory and a data statistical index thereof by utilizing the preprocessed drilling parameters; establishing a corresponding relation between RTPR statistical indexes and surrounding rock engineering properties, finally establishing a forecasting reference surface according to the condition of the tunnel face, predicting unknown stratum distribution and surrounding rock lithology according to the known condition of the tunnel face, and integrating the rough partition condition to obtain a final forecasting result. According to the method, drilling field data can be effectively utilized, and fine forecasting of advanced drilling of the tunnel is achieved.

Description

technical field [0001] The invention relates to the field of tunnel geological survey, in particular to a method and application of a fine geological prediction method for advanced drilling of tunnels. Background technique [0002] At present, the types of tunnels built in China have developed to be long and large, which brings many unforeseen complex and unfavorable geological bodies such as karst, water and mud inrush, gas, etc. The prediction has always been an important and difficult point in tunnel geological prediction. The advanced drilling method is currently the most direct and effective geological detection method for predicting complex and unfavorable geological bodies in tunnels. At present, medium and long-distance (0-150m) detection can be carried out, and it can accurately and intuitively reflect the surrounding rock geological conditions around the borehole. At present, the accuracy of advanced drilling prediction results depends on the interpretation of dril...

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Problems solved by technology

At present, the accuracy of advanced drilling prediction results depends on the interpretation of drilling parameters and liquid return and slag discharge, which requires a high level of forecasting experience for interpreters. The results are generally limited to the division of the degree of softness and hardness of the surrounding rock or the rough judgment of the degree of crack development in the surrounding rock based on the unsteady oscillation of the drilling parameters. The fundamental reason is that the simultaneous analysis of multiple drilling parameters is not only inefficient but also cannot be accurately predicted. The detailed characteristics of the unknown formation lead to a waste of a lot of useful drilling parameter response information, and the misjudgment rate is extremely high

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